Scientists Say: Explosion
An explosion is a chemical or nuclear reaction that blasts out a lot of heat, noise and expanding gas
![purple and gold fireworks explode in the night sky over big ben](https://www.snexplores.org/wp-content/uploads/2023/06/1440_SS_explosion_feat-1030x580.jpg)
Firework explosions lit up the sky in London, England, with colorful lights on New Year’s 2023.
Dan Kitwood/Staff/Getty Images